landis



-- v I 2 Sheetsshe'et' 1. J. H .'LA NDIS. MACHINE FOR SHARPENING AND.SETTING SAWS.

(No Model.)

Patented Jan. 24, 1893.

In: uonms Pzrzns co, PwOTO-LITHQ. WASHINGTON, w. c.

(No Model.) 2 Sheets-Sheet 2.

J.- H.- LANDIS. MACHINE FOR SHARPENING AND SETTING SAWS.

' No. 490,410, Patented Jan. 24, 1893.

nym I 4mm: 2 I

Za'yai 12 Q NITED STATES ATENT Erica.

MACHINE FOR SHARPENYI NG AND SETTING SAWS.

SPECIFICATION formingpart of Letters Patent No. 490,410, dated January24, 1893.

Application filed May 18. 1892- Serial No.433,4=86- (N0 model.) Patentedin France September 26, 1890 N0. 205M174; in Switzerland September29,1890, No. 2,693, and in Germany October 2, 1890, No. 57,216.

To all whom it may concern:

Be it known that I, J OHANN HEINRICH LAN- DIS, sawmill-owner, a citizenof Switzerland, residing at Oerlikon, in the canton of Zurich,Switzerland, have invented certain new and useful ImprovementsinMachines for Sharp ening and Setting Saws; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention has been patented in France, No. 208,474, dated September26, 1890; in Switzerland, No. 2,693, dated September 29, 1890, and inGermany, No. 57,216, dated October 2, 1890.

Thisinvention relates to machines forsharpening and setting saws, andconsists in the construction and combination of devices hereinafterparticularly set forth and claimed.

In the accompanying drawings Figure 1 is a front View; Fig. 2 a sideelevation; Fig. 3 a plan of the improved machine; Fig. 4. is a plan on asomewhat enlarged scale of the bent frame or yoke carrying the emerywheel. Figs. 5 to 8 are detail views of various parts of the settingdevice. Fig. 9 shows the support used in setting circular saws, and Fig.10 is a cross section of the saw-blade guide.

The combined mechanism is arranged upon table A resting upon a suitablepillar or support and receives motion from the main shaft a. By means ofthe beveled friction-wheels a a motion is conveyed to it through themedium of a strap 1) upon a strap-pulley 13. Upon the shaft 1) of thispulley is mounted a toothed wheel 0 gearing with the wheel 0 rigidlysecured upon the shaft 0'. The wheel at follows the movement of theshaft 0' and in addition to this is capable of moving to a slight extentalong the said shaft upon the feather 01. By means of a set screw thewheel 61 is retained in the adjusted position. By throwing this wheel (Zinto or out of gear, as the case may be, the setting mechanism,hereinafter to be described is set in motion or arrested. The saw-bladeis guided, and the emery wheel oscillated, from the shaft 0. Upon thisshaft 0 also an eccentric d (Fig. 1) is keyed, upon the periphery ofwhich rests the slide 0 working in the guide e in the supporting tableA. Into this slide 0 is screwed the spindle e, in the head 6 of whichthe roller f is loosely journaled, so that this roller does notnecessarily follow the movements of the spindle 6. Upon the said rollerflies the bent frame or yoke D carrying the emery-wheel and adaptedfreely to turn about the bolt or rod f of the adjust able, pivotedbracket E (Figs. 1 and 4.)

The emery or grinding wheel F is mounted in the frame D in such a mannerthat its axis in each position exactly coincides with the vertical planeof the saw-blade, whereby an uneven sharpening of the teeth iseffectively prevented. As the arm of the yoke D enters a groove providedfor the purpose in the roller fthe rising and sinking movements of theslide 0 are transmitted to the emery-wheel. The pivoted block E isadjustable along a grooved or slotted supporting segment G,and bytightening the screw 9, the head of which moves in the groove g of G, itmay be retained in any desired position. The support G is secured to thetable by screws or the like. The conical trunnions or bearings h of theemery or like grinding-wheel F are supported at h thereby rendering thesaid grinding wheel adjustable sidewise, bolts or screwsvl serve toretain it in the adjusted position. To secure a strong and reliablesupport for the grinding-wheel F, the conical trunnions h are truncated,so that the wear of these trunnions both at the end surface and on thecircumference is always uniform.

The size and shape of the grinding-wheel may vary according to thedesired shape of the teeth. As the grinding wheel in addition to itsrotation on its own axis, is adapted to oscillate on the bolt or spindlef, the back of each tooth is so sharpened as to assume a somewhatconcave shape and the grinding is directed toward the point of thetooth, which is one of the requirements for a good saw-cut.

Lines I and II show the two extreme positions of which the shifting yokeis capable of reaching upon the supporting segment G. The grinding wheelis driven from the pulley 1 by means of a band, cord or equivalent andthrough the medium of two guide-pulleys 2 and 3, whence the band or cordreturns to the pulley 1. The socket 4 of the guide rollersupport 5 issupported by a disk 6 and may be retained in any required positionthereon by means of the bolt or screw 7. The feed ing or guidingmechanism is also operated from the shaft 0, provided for this purposewith a tappet or cam 70, which at each revolution once depresses thehorizontal arm of the bell-crank lever Z pivoted at Z. The vertical armof the bell-crank lever carrying the blade or arm m, adjustable in theguide Z and exchangeable, then performs a movement in the forwarddirection and causes the sawblade to advance the space of onetooth,whereupon the spring m pulls the bell-crank lever back to itsinitial position, in which its vertical arm rests against the set-screwn. According as this screw, to a greater or less extent is screwed intothe support a, the displacement of the vertical arm of the bellcranklever will be confined within narrower or wider limits, and theadjustability of the feeding device will vary accordingly. The feedingtakes place for each successive tooth separately, in such a manner thatafter one tooth is sharpened the next tooth is fed forward and for thispurpose the curve of the tappet is such that the return of the feedingblade, though very rapid, causes no violent shock of the bell-cranklever against the screw 71.

To secure all the parts of the guiding or feeding mechanism in theproper positions, previously to setting the machine in operation, theshaft 0 is acted upon, being for this purpose adapted for' operation byhand; for example, if no circular saw is to be sharpened or set acrank-handle 0 may simply be fitted to c. here the front end of c ismade inaccessible by a circular saw blade, the shaft 0' may be driven bymeans of ahand wheelo.

H is adevice for guiding band and veneersaw-blades.

By turning the hand-wheelp the bevel pinion J and through it thevertical screw spindle j are set in motion, whereby the bladeguide iscaused to rise or fall along with the saw-blade which it guides at thecenter and at both ends.

(1 q are the central and lateral guides for the vise or screw-holder andthe brakes for the saw-blades. These guides are constructed asfollows:The removable front part r of the guide shown in Figs. 1 and 10is connected with the portion secured to the supporting table by meansof a screw 9 The saw blade passes between the two parts and is retainedin position by the slightly yielding action of the front portion whichat the same time acts upon it as a check or brake. By means of a setscrew r the result is secured, that the plate .9 is always in contactwith the surface of the saw-blade, which is desirable both for correctlyguiding and properly checking the saw. Then a saw-blade is inserted orremoved all the front parts of the guides are turned up about the screws0", whereby free access is obtained on the front side. The

saw-blade is secured in the well-known manner to a support L which mayalso be raised and lowered by means of the vertical screw spindle Inoperating the saw-setting mechanism the wheel 61 is thrown into gearwith the wheel .9 mounted upon the shafts. The front end of this shaft8' carries a disk or cam O adapted to actuate the setting mechanismproper. This mechanism consists of two cheeks t 25, one of whicht ismovable, and the other t stationary. The movable cheek i is supported bythe piece t fitted within a dovetailed groove a. t designates two rails,by leaning against which the cheekst t retain the proper position. Thechecks 15 ii are adjustable according to the pitch of the saws, screwsbeing provided for fixing them in the adjusted position. The spring to,one end of whichis secured to the supporting table A, while the otherend is attached to the sliding piece t of the cheek t, constantlypresses the slide 25 into contact with the disk 0 and causes it to shiftinwardly and outwardly to suit the projections and recesses of the saw.When the cheek t is thus moved inwardly the inclined setting tooth cpresses the tooth of the saw passing between the two cheeks t and tagainst a correspondingly inclined surface 12 provided on the stationarycheek t, Figs. 5 to S. A similar movement in the opposite direction isperformed by the setting tooth 'u of the stationary cheek t, so that twoteeth are set simultaneously. The movable cheek i then recedes and thesteering or feeding mechanism above described causes another pair ofsaw-teeth to advance for setting. The sawblade is constantly'kept incontact with the movable check by spring-action applied in' placesimultaneously. WVhen the piece H is raised by means of thehand-wheel 1) both the saw-blade and the grinding-wheel may during theoperation be brought into any desiredposition by suitably screwing upthe arm m in the guide Z and correspondingly screwing inward or outwardthe screw-spindle.

Having now particularly describedand ascertained the nature of my saidinvention and. in what manner the same is to be performed I declare thatwhat I claim is;--

1. In a saw grinding machine the grinding wheel F having its axis in thevertical plane of the saw in combination with its supporting frame I),the block E to which the said frame is pivoted, the segment G in whichthe said IIO block is adj ustably secured, the rotating cam a spindlewhich supports the free end of the [0 d the slide 0 in contact with thesaid cam said frame and is screwed into the said slide and an attachmentof the saidslide arranged to allow adjustment substantially as setforth.

in contact with the said frame for raising and In testimony whereof Ihave affixed my siglowering the free end thereof as the said cam naturein presence of two witnesses.

turns substantially as set forth. J OHANN HEINRICH LANDIS.

2. In combination with a grinding wheel Witnesses:

and a pivoted frame in which it is mounted, A. BOURRY SEGUIN,

a cam, a slide acted on by the said cam and HENRY LABHART.

